Valve for pneumatic actions.



L. B. DOMAN.

VALVE FOR PNEUMATIC ACTIONS. APPLIOATION FILED MAR. 25, 1910.

1,01 7,85 7'. Patented Feb. 20, 1912.

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. To all whom it my concern.

' Valves for Pneumatic Actions,

251 the air passages citizen of the United States,

object, among other things,

' partial vacuum,

STATES PATENT OFFICE.

nnwis'n, :oonu'm', or SYRACUSE,

NEW YORK, ASSIGNOB TO THE AMPHION PIANO 7 PLAYER COMPANY, OF SYRACUSE,NEW YORK, A CORPORATION OF-NEW YORK.

VALVE son PNE MATIC sorrows.

Specification of Letters Patent.

Patented Feb. 20, 1912.

Application filed March 25, 191i). Serial No. 551,545.

- Be it known "that I, LEWIS B. DOMAN, a and a resident of. the city ofSyracuse, county of Onondaga, and State of New York, have lnventedcertain new and useful Improvements in of which the following isa-specification, reference being bad to the accompanying drawings, inwhichh Figure 1 is a sectional view of "my improved valve; Fig. 2 isatop'plan view looking downwardly on- Fig. 1"; Fig. 3 15a plan view ofthe bottom. looking upwardly at Fig. 1, with the lower part of 'the airchamber removed Fig. 4 is anenlarged view of a part of said valve shownin Fig. 1.

throughout the several figures.

This inventionrelates to valve mechanisms in pneumatic actions, moreparticularly used in mechanical musical instruments, and 1ts is toprovide a simple and efiicient means for controlling leading from thepneumatic action proper that the operation of the instrument, as forinstance an automatic piano player, can be cutout of use during there-windingof the music from the take-up roll to the music roll. Myimproved device, however, is not limited to musical instruments, but maybe used in any other mechanism where it is desirable to control the airpassage.

Referring now to the figures, and assuming that the pneumatic action isone employing rarefied air, or that operates under a X. represents anair chamber for the'elements making up the valve.

A is a pipe connected tothe pneumatic action.

B is apipe or passage connected to the wind Chest. 015 the bellows.

D is a flexible diaphragm, preferably made of leather, extendinghorizontally across-the, air chamber X and located to close the orificeof the passage A at G, as shown. in Fig. 1. I

E is a" tube with a manually controlled valve placed in any positionjconvenie'nt to the operator; F is another tube connected below thediaphragm D as shown in Fig. 1, and likewise with a nipple G containinga restricted passage or air vent.

The operation of my improved valve is as .to the wind chest, so

' pheric air follows. The passage B is under partial vacuum or rarefiedair and is connected with the pipe or passage A as shown in Fig. 1. Ifair at atmospheric pressure he admitted to the compartment M below thediaphragm through the tube E, such diaphragm D will at once rise andclose the passage at the lower end of the pipe A at C,l'l1llS preventingair under a partial vacuum from passing through the passage A andthereby. cutting out of operation the pneumatic action or other deviceoperating under the partial vacuum which may be connected to the pipe A.lVhen it is desired to open the passages so as to connect A with B thetube E is closed and the excess pressure, that is the pressure of theatmosphere in the compartment M under the diaphragm D is immediatelyequalized through the passages F and G, and this will cause thediaphragm E to fall and restore the unrestricted passage through thepipe A, the compartment N, and the pipe B.

WYhat I claim as new-and desire to secure by Il etters Patent is thefollowing, viz

1. In combination with a pneumatic action, a valve comprising an airchamber, a

conduit leading from the wind chest into said air chamber, a secondconduit leading tronr the pneumatic action and projecting within saidair chamber to form a, valveseat, a flexible diaphragm extending acrosssaid air chamber to provide a closure for said valve-seat, means foradmitting air to inflate said diaphragm to close the valve, and means toequalize the air pressure on both sides of the diaphragm to open thevalve.

2. In combination with a pneumatic action, a valve comprising an airchamber, a conduit leadlng from-the wind chest into said air chamber, asecond conduit leading I from the pneumatic action and projecting w1th1nsaid air chamber to form a valveseat, a flexible diaphragm extendingacross said air chamber to provide a closure for said valve-seat, atube. opening to atmosbelow said. diaphragm to inflate same to elosethe'valve, anda restricted passag'econnectin the compartments bn oppositesides 0 the diaphragm to. deflate same to openthe valve. when the tubecontrolling -atmospheric air is closed.

3. In combination with a pneumatic'action, a valve comprising anairchamber X,

the pipe A anctthe pipe B, both opening into the exhaust chamber N ofthe air chain; her X, the pipe B projecting into said air chamber toform a valve-seat C, the dia- -phragm D extending across said aircha1nher and adapted to close the valve-seat C, the tube E to admltairat atmospheric pres-4 sure belowthe diaphragm D to inflate same to closethe valve-seat C, and the restricted air passages F, G, connecting theconipart- 10 ments M and N on opposite sides of the diaphragm I) todeflate same to ,open the Valve 'when the tube 1 1) is closed.

Copies of thispatent may'be obtained for five een-ts each, by addresingthe Commissioner of Patents,

- Washington, I). 0.?

